Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-24T08:20:35.823Z Has data issue: false hasContentIssue false
  • English
  • Français

Morimotoite, Ca3TiFe2+Si3O12, a new titanian garnet from Fuka, Okayama Prefecture, Japan

Published online by Cambridge University Press:  05 July 2018

Chiyoko Henmi ,
Isao Kusachi  and
Kitinosuke Henmi
Chiyoko Henmi
Affiliation:
Department of Earth Sciences, Faculty of Science, Okayama University, Okayama 700, Japan
Isao Kusachi
Affiliation:
Department of Earth Sciences, Faculty of Education, Okayama University, Okayama 700, Japan
Kitinosuke Henmi
Affiliation:
1-9-20, Ishima-Cho, Okayama 700, Japan
Get access Rights & Permissions [Opens in a new window]

Abstract

Morimotoite, Ca3TiFe2+Si3O12, has been found in contaminated rocks which are considered to be a kind of endoskarn at Fuka, Bitchu-Cho, Okayama Prefecture, Japan. Morimotoite is derived from andradite, , by the substitution Ti + Fe2+ = 2Fe3+. It is associated with calcite, vesuvianite, grossular, wollastonite, hematite, prehnite, fluorapatite, perovskite, zircon, baddeleyite and calzirtite. It is cubic with space group Ia3d. The unit cell dimension a is 12.162(3) Å. Its refractive index n is 1.995(2) and the density 3.75(2) g cm−3 (meas.), 3.80 g cm−3 (calc.). The Mohs' hardness is 7.5. Calculation of the analytical data on the basis of twelve oxygen atoms and eight cations shows that this mineral has a simplified chemical formula Ca3(Ti,Fe2+Fe3+)2(Si,Fe3+)3O12 where Ti > Fe2+ > 0.5. Morimotoite was synthesized at low oxygen fugacities, 650 and 700°C and 1 kbar total pressure.

Keywords

morimotoitetitaniumgarnetskarnOkayama PrefectureJapan
Type
Mineralogy
Information
Mineralogical Magazine , Volume 59 , Issue 394 , March 1995 , pp. 115 - 120
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Burnham, C.W. (1959) Contact metamorphism of siliceous limestones at Crestmore, California. Geol. Soc. Amer. Bull, 70, 879–920.CrossRefGoogle Scholar
Dawson, J.B, Smith, J.V. and Steele, I.M. (1992) 1966 ash eruption of the carbonatite volcano Oldoinyo Lengai: mineralogy of lapilli and mixing of silicate and carbonate magmas. Mineral. Mag., 56, 1–16.CrossRefGoogle Scholar
Deer, W.A., Howie, R.A. and Zussman, J. (1982) Rock-forming minerals, 1A, 2nd ed., 617-41.Google Scholar
Dowty, E. (1971) Crystal chemistry of titanian and zirconian garnet: I. Review and spectral studies. Amer. Mineral, 56, 1984–2009.Google Scholar
Flohr, M.J.K. and Ross, M. (1989) Alkaline igneous rocks of Magnet Cove, Arkansas: metasomatized ijolite xenoliths from Diamond Jo quarry. Amer. Mineral, 74, 113–31.Google Scholar
Gaeta, M. and Mottana, A. (1991) Phase relations of aenigmatite minerals in a syenite ejectum, Wonchi volcano, Ethiopia. Mineral. Mag., 55, 529–34.CrossRefGoogle Scholar
Gongbao, W. and Baolei, M. (1986) The crystal chemistry and Mossbauer study of schorlomite. Phys. Chem. Minerals, 13, 198–205.CrossRefGoogle Scholar
Henmi, C, Henmi, K., Sabine, P.A. and Young, B.R. (1973) A new mineral bicchulite, the natural analogue of gehlenite hydrate, from Fuka, Okayama Prefecture, Japan and Carneal, County Antrim, Northern Ireland. Min. J., 7, 243–51.CrossRefGoogle Scholar
Henmi, C, Kusachi, I., Kawahara, A. and Henmi, K. (1977) Fukalite, a new calcium carbonate silicate hydrate mineral. Mineral. J., 8, 374–81.CrossRefGoogle Scholar
Howie, R.A. and Woolley, A.R. (1968) The role of titanium and the effect of TiO2 on the cell-size, refractive index, and specific gravity in the andradite—melanite—schorlomite series. Mineral. Mag., 36, 775–90.Google Scholar
Huckenholz, H.G. (1969) Synthesis and stability of Ti-andradite. Amer. J. Scl, 267, 209–32.Google Scholar
Huggins, F.E., Virgo, D. and Huckenholz, H.G. (1977a) Titanium-containing silicate garnets. I. The distribution of Al,Fe3+, and Ti4* between octahedral and tetrahedral sites. Amer. Mineral, 62, 475–90.Google Scholar
Huggins, F.E., Virgo, D. and Huckenholz, H.G. (1977fc) Titanium-containing silicate garnets. II. The crystal chemistry of melanites and schorlomites. Amer. Mineral, 62, 646–65.Google Scholar
Ito, J. and Frondel, C. (1967) Synthetic zirconium and titanium garnets. Amer. Mineral, 52, 773–81.Google Scholar
Koenig, G.A. (1886) fiber den Schorlomit, eine Verietat des Melanits. Proc. Acad. Nat. Sci. Philadelphia, 355.Google Scholar
Kusachi, I., Henmi, C. and Henmi, K. (1975) Schorlomite from Fuka, the Twon of Bitchu, Okayama Prefecture. J. Mineral. Soc. Japan, 12, 184-91 (in Japanese).Google Scholar
Morimoto, N. (1988) Nomenclature of pyroxenes. Mineral. Mag., 52, 535–50.CrossRefGoogle Scholar
Platt, R.G. and Mitchell, R.H. (1979) The Marathon dikes. I: Zirconium-rich titanian garnets and manganoan magnesian ulvospinel-magnetite spi-nels. Amer. Mineral, 64, 546–50.Google Scholar
Schwartz, K.B., Nolet, D.A. and Burns, R.G. (1980) Mossbauer spectroscopy and crystal chemistry of natural Fe-Ti garnets. Amer. Mineral, 65, 142–53.Google Scholar
Tarte, P., Cahay, R. and Garcia, A. (1979) Infrared spectrum and structural role of titanium in synthetic Ti-garnets. Phys. Chem. Minerals, 4, 55–63.CrossRefGoogle Scholar
Virgo, D., Rosenhauer, M. and Huggins, F.E. (1976) Intrinsic oxygen fugacities of natural melanites and schorlomites and crystal-chemical implications. Carnegie Inst. Wash. Year Book, 720-9.Google Scholar